Connectify Hotspot is a virtual router that lets you share Wi-Fi, 3G/4G, and ethernet connections on your PC with your friends, family, and other devices.

Virtual Router is a open-source WiFi hotspot software.

NetSpot is a software tool for wireless network assessment, scanning, and surveys, analyzing Wi-Fi coverage and performance.

MyPublicWiFi is an easy-to-use software that turns your laptop/PC into a Wi-Fi wireless access point.